Yesterday, Microsoft users reported that a bug has affected the Microsoft Windows activation service which causes the Windows 10 Pro licenses to be downgraded to Windows 10 Home, says Bleepingcomputer. Following this, the bug flashes a message on user’s screen stating that their license is not activated and prompting the user to troubleshoot the problems.

According to a Reddit post, “Microsoft has just released an Emerging issue announcement about current activation issue related to Pro edition recently. This happens in Japan, Korea, American, and many other countries. I am very sorry to inform you that there is a temporary issue with Microsoft’s activation server at the moment and some customers might experience this issue where Windows is displayed as not activated. Our engineers are working tirelessly to resolve this issue and it is expected to be corrected within one to two business days.”

Jeff Jones, Sr. Director, Microsoft., told BleepingComputer, “We’re working to restore product activations for the limited number of affected Windows 10 Pro customers.” He added, “A limited number of customers experienced an activation issue that our engineers have now addressed. Affected customers will see a resolution over the next 24 hours as the solution is applied automatically. In the meantime, they can continue to use Windows 10 Pro as usual.”